usb: musb: host: fix potential NULL pointer dereference

Quoted 4 lines · Bin Liu

musb_start_urb() doesn't check the pass-in parameter if it is NULL. But in musb_bulk_nak_timeout() the parameter passed to musb_start_urb() is returned from first_qh(), which could be NULL.

Quoted 4 lines

So wrap the musb_start_urb() call here with a if condition check to avoid the potential NULL pointer dereference.

Fixes f283862f3b5cb("usb: musb: NAK timeout scheme on bulk TX endpoint")

Nit, you forgot a ' ', this should be:
f283862f3b5c ("usb: musb: NAK timeout scheme on bulk TX endpoint")

You also had one extra id value in there, odd. I'll edit this by

hand...